At no point had Archbishop Tutu indicated his discomfort at speaking at the same conference as Prime Minister Blair and therefore his withdrawal was unexpected," said Hylton Kallner, Discovery's chief marketing officer.

Instead of growing old gracefully, at home with my family reading and writing and praying and thinking, too much of my time has been spent at airports and in hotels," Tutu said in a statement when he announced his retirement earlier this year.

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